Method for predicting amount of corrosion in steel, system for predicting amount of corrosion in steel, program for predicting amount of corrosion in steel and method for proposing steel

Abstract

There is provided a method for predicting the amount of corrosion in a steel including a step in which, based on a weather observation value Wat a scheduled use point M of the steel, a corrosion index Q(t, W) is obtained for each past observation time t, extremal value statistical analysis is performed on time-series data of the corrosion index Q(t, W) between observation times tto t, and a maximal value Q(t) of the corrosion index within future evaluation periods tto tis estimated, and a corrosion amount estimation step in which a relational expression between a measured corrosion amount obtained in a corrosion test at a test point Z and the maximum value of a corrosion index Q(t, W) obtained for each observation time tduring a test period of the corrosion test based on a weather observation value Wat the test point Z is obtained in advance, the maximal value Q(t) of the corrosion index estimated above is introduced into the relational expression, and an estimated value of the amount of corrosion in the steel during the estimated period is obtained.